Life on Shiva loka and Sada Shiva loka ?

According to the Bhagavad Gita Brahma lok is the highest material planet. This means any planet higher than Brahma lok is not material but spiritual. Shiva lok and Sada Shiva lok are mentioned higher than Brahma lok therefore they are spiritual planets where life is eternal i.e there is no birth, death, misery etc.

Can someone please tell me about the life that people live on Shiva lok and Sada Shiva lok ?